Add debug memory tracking to SkiaGLPipeline

Test: Sample output is below

D/OpenGLRenderer: Resource Cache Usage:
D/OpenGLRenderer:       32 items out of 8192 maximum items
D/OpenGLRenderer:  4635572 bytes (4.42 MB) out of 96.00 MB maximum

This is less verbose than OpenGL memory debug output for
two reasons:
(1) SkiaGL has less caches.
(2) SkiaGL does not support printing on cache additions/evictions.
    This seems like more of an internal debugging tool rather than
    a user-facing debug feature.  I think it's best to leave this
    unimplemented until we find that it might be useful.

BUG:32370375

Change-Id: Ib063f1c2a7f88e9840341b1001d227f556d88f26